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most car branded seat are actuarial britax as they use britax seat in the ncap safety test had a look on honda website and they are britax so if you look at the britax fit finder you will see weather the seat fits from my quick look both the seat should fit.

Agree with RealityBomb you can't use a second hand carseat unless you are 100% confident of it's history. i.e. carseat from friend or family where you are sure it hasn't been in a crash is ok, carseat from ebay etc. not ok.